Other Financial Information Other Financial Information (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 5,714,691
Other comprehensive income (loss)	(16,245)	$ (110,109)	$ (153,189)
Ending balance	5,815,712	5,714,691
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(916,812)	(806,703)
Other comprehensive income (loss)	(19,233)	(187,900)
Reclassifications from other comprehensive income (loss)	(2,988)	(77,791)
Ending balance	(933,057)	(916,812)	(806,703)
Change in Pension and Retiree Medical Plan Liabilities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(436,749)	(309,867)
Other comprehensive income (loss)	(61,994)	(104,434)
Reclassifications from other comprehensive income (loss)	17	(22,448)
Ending balance	(498,726)	(436,749)	(309,867)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(480,045)	(496,017)
Other comprehensive income (loss)	60,330	(84,456)
Reclassifications from other comprehensive income (loss)	0	100,428
Ending balance	(419,715)	(480,045)	(496,017)
Gain/(Loss) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(18)	(819)
Other comprehensive income (loss)	(17,569)	990
Reclassifications from other comprehensive income (loss)	2,971	(189)
Ending balance	$ (14,616)	$ (18)	$ (819)